﻿// 
//    Copyright 2010 The JaernCloud Project
// 
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
// 
//        http://www.apache.org/licenses/LICENSE-2.0
// 
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.
// 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using JaernCloud.Language.Compiler.Ast;

namespace JaernCloud.Language.Compiler.Types.Builtin {

    public class ActionNodeType : NodeType, IActionNodeType {
        
        public static readonly string ACTION_PREFIX = "->";

        private IActionNodeType _target;

        public override AstTag GetRequiredAstTag() {
            return AstTag.FromName("action");
        }

        public override INodeType GetNodeTypeInstanceFor(AstNode node) {
            return new ActionNodeType { SourceNode = node };
        }

        public string ActionName {
            get { return SourceNode.Tag.Name; }
        }

        public IActionNodeType Target {
            get {
                if (_target == null) {
                    NodeIdentifierScope scope = new NodeIdentifierScope(this);
                    AstTagSelector actionSelector = new AstTagSelector(AstTag.FromName(ActionName));
                    var targets = scope.Lookup(actionSelector);
                    if(targets != null) {
                        foreach (var target in targets) {
                            if (target is IActionNodeType) {
                                _target = target as IActionNodeType;
                                break;
                            }
                        }
                    }
                }
                if (_target == null) {
                    throw new ActionException(this.SourceNode, "Unable to resolve target for action");
                }
                return _target;
            }
        }

        public bool IsAsync {
            get { return SourceNode.IsAsync; }
        }

        public bool IsAjax {
            get { return SourceNode.IsAjax; }
        }
        public bool HasAction {
            get { return true; }
        }

        public void ExecuteAction(IActionNodeTypeOwner owner, IList<INodeType> arguments = null) {
            throw new NotImplementedException();
        }

        public override string ToString() {
            StringBuilder sb = new StringBuilder();
            if (IsAjax) {
                sb.Append("ajax ");
            }
            if (IsAsync) {
                sb.Append("async ");
            }
            return  base.ToString();
        }

    }
}